Xylem SuSix Turbidity and Suspended Solids Transmitter - Manual (Page 23)

23 FW: 841013-005/843003-001
Turbidity and Suspended Solids Transmitter
EN 5.10 SuSix Manual 1406
4. Sensor Calibration
Turbidity
The SuSix ® sensor is factory calibrated for turbidity measurements. No
further calibration is required.
Suspended Solids
Calibration is required prior to using the SuSix ® for suspended solids
measurements.
Important!
Suspended solids calibration must be carried out at fixed
intervals.
If a distinct change in composition and/or colour of the process appears,
the SuSix
® must be re-calibrated immediately.
Note: Representative measuring values can only be expected if the
calibration point is obtained at a sludge concentration of more
than 50% of the application’s nominal range.
Calibration may be 1-point, 2-point or 3-point as required. Normally a
1-point calibration will be sufficient.
Zero-point calibration is not required!
Calibration Procedures
1. Take out the SuSix ® sensor and clean it according to the directions in
the section about cleaning the sensor during maintenance.
2. Extract a sample from the actual process.
The necessary volume must be at least 10 litres. The sample is ana-
lyzed at a laboratory, and the content of suspended solids can be
determined. This value must be kept as it is required later on.